From: Chris Wilson <[email protected]>

The complication is that during seqno wrapping we must be extremely
careful not to write to any ring as that will require a new seqno, and
so would recurse back into the seqno wrap handler. So we cannot call
i915_gpu_idle() as that does additional work beyond simply retiring the
current set of requests, and instead must do the minimal work ourselves
during seqno wrapping.

Signed-off-by: Chris Wilson <[email protected]>
Reviewed-by: Mika Kuoppala <[email protected]>
---
 drivers/gpu/drm/i915/i915_gem.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e414507..e753cfc 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1938,11 +1938,15 @@ i915_gem_handle_seqno_wrap(struct drm_device *dev)
        if (ret == 0)
                return ret;
 
-       ret = i915_gpu_idle(dev);
-       if (ret)
-               return ret;
-
+       /* Carefully retire all requests without writing to the rings */
+       for_each_ring(ring, dev_priv, i) {
+               ret = intel_ring_idle(ring);
+               if (ret)
+                       return ret;
+       }
        i915_gem_retire_requests(dev);
+
+       /* Finally reset hw state */
        for_each_ring(ring, dev_priv, i) {
                ret = intel_ring_handle_seqno_wrap(ring);
                if (ret)
-- 
1.7.9.5

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